Laser stability Takuya Natsui Oscillator phase lock stability

Laser stability Takuya Natsui

Oscillator phase lock stability

Cavity length drift Phase lock stability Price Menlo products << 0. 1 um 0. 0 (detection limit) $ 150000 (1800 万円) Oscillator 1 3 um 2. 0 deg $ 35000 (400万円) Oscillator 2 1 um 0. 58 deg $ 35000 (400万円) Oscillator 3 ANDi type 1 um 0. 64 deg $ 35000 (400万円)

Piezo position (cavity length drift) Stability： 0. 58 deg Stability： 0. 64 deg Stability： 2. 0 deg

Oscillator phase lock system

Commercial products also tested Zurich Instruments UHFIL Lok-in Amplifier 0. 056 deg in 114 MHz 0. 3 deg in 571 MHz Stability: 1. 5 deg in 2856 MHz

Developed synchronization system $10000 Stability: 0. 64 deg Commercial products $60000 Stability: 1. 5 deg Compared in same oscillator, developed synchronization system has enough capability.

laser operation log

Laser system and detect point We have five constant monitoring points. Photo diode x 4, Power meter x 1 0. 2 n. J @ 1037 nm Yb-doped fiber oscillator with Transmission grating 51. 9 MHz Synchronization system 2856 MHz trigger From Accelerator Yb-doped fiber pre amplifier >μJ @ 1037 nm Yb-doped fiber main amplifier Transmission grating pair stretcher Pulse picker 10 MHz 2, 5, 25, 50 Hz Single or Double bunch Pulse picker PD 1 Yb: YAG thin-disk multipass cavity amplifier PD 2 Yb-doped fiber pre amplifier Yb-doped fiber main amplifier Yb: YAG thin-disk multipass amplifier × 3 Fix the configuration to 25 Hz operation RF GUN SHG Power meter PD 3 PD 4

Laser pulse power is detected with photo diodes and oscilloscope. Detector (photo diode)

Fiber amp. start-up Disk amp. 3 Disk amp. 1 Disk amp. 2 First, fiber amplifier drifts Laser is stabled gradually

Sometimes fiber amplifier drifts Disk amplifier is damaged

Recently, 1 or 2 days stabilization was achieved.

Recent operation log Disk amplifier is damaged Fix O BB Fundamental laser power Beam charge BPM error We achieved two days stable operation. (0. 7 +/-0. 3 n. C)

Still long term drift occur. We will increase detection points. Develop power feed back systems. Pointing stability detector is also developing with quadrant sensor.

Oscillator phase detect 2856 MHz IQ signal 52 or 114 MHz IQ signal